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r in (-oo:+oo)
r+3*r+10 = (1/3)*(6*r+12) // - (1/3)*(6*r+12)
r-((1/3)*(6*r+12))+3*r+10 = 0
(-1/3)*(6*r+12)+r+3*r+10 = 0
r-1/3*(6*r+12)+3*r+10 = 0
r-1/3*(6*r+12)+3*r+10 = 0
3*r-r-4+10 = 0
2*r-4+10 = 0
2*r+6 = 0
2*r+6 = 0
2*r+6 = 0 // - 6
2*r = -6 // : 2
r = -6/2
r = -3
r = -3
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